/** Returns the names of all currently registered authorities. */
public static synchronized Set<String> getAuthorityNames() {
/*
* IMPORTANT: Return the same Set instance (unmodifiable) as long as there is no change
* in the list of registered factories, and create a new instance in case of changes.
* 'add/removeAuthorityFactory(...)' and 'scanForPlugins()' methods reset 'authorityNames'
* to null, which will cause the creation of a new Set instance. Some implementations like
* AllAuthoritiesFactory rely on this behavior as a way to be notified of registration
* changes for clearing their cache.
*/
if (authorityNames == null) {
authorityNames = new LinkedHashSet<String>();
final Hints hints = EMPTY_HINTS;
loop:
for (int i = 0; ; i++) {
final Set<? extends AuthorityFactory> factories;
switch (i) {
case 0:
factories = getCRSAuthorityFactories(hints);
break;
case 1:
factories = getCSAuthorityFactories(hints);
break;
case 2:
factories = getDatumAuthorityFactories(hints);
break;
case 3:
factories = getCoordinateOperationAuthorityFactories(hints);
break;
default:
break loop;
}
for (final AuthorityFactory factory : factories) {
final Citation authority = factory.getAuthority();
if (authority != null) {
authorityNames.add(Citations.getIdentifier(authority));
for (final Identifier id : authority.getIdentifiers()) {
authorityNames.add(id.getCode());
}
}
}
}
authorityNames = Collections.unmodifiableSet(authorityNames);
}
return authorityNames;
}
/**
* Returns the selected object, usually as a {@link CoordinateReferenceSystem}.
*
* @return
* @throws FactoryException if the factory can't create the selected object.
*/
public IdentifiedObject getSelectedItem() throws FactoryException {
final String code = getSelectedCode();
return (code != null) ? factory.createObject(code) : null;
}